Well, isn't that a happy little question! When we have a variable like y and we add 4 to it, we simply combine y with 4 to make y + 4. It's like adding a few extra trees to our painting to make it even more beautiful. Just remember, there are no mistakes, only happy accidents in math and art.
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In algebra, "y plus 4" represents the sum of a variable "y" and the constant 4. This expression cannot be simplified further unless the value of "y" is known. Therefore, "y plus 4" is the sum of "y" and 4.
It is simply y + 4. Until you know (or can find) the value of y, this expression cannot be evaluated.
y2 + 8y + 16 = y2 + 4y + 4y + 16 = y(y + 4) + 4(y + 4) = (y + 4)(y + 4) or (y + 4)2
x = 0 and y = 4
xy plus 2x plus 4y plus 8 or (xy+2x) + (4y+8) or x(y+2) + 4(y+2) or (x+4)(y+2)
y2 +8y + 16 = 0 can factor to (y+4) (y+4) = 0 so y+4 = 0 so y = -4
If you mean y+10 = 4 then the value of y is -6